From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6169DFF885A for ; Tue, 5 May 2026 11:09:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=IVJfobToIIbQS+LK3dO6loNuJTGbzehi/g6dvyC5Lo8=; b=vAtWd3U7dAORi2eiTVACgnpdvV Pyr/q49TTGSnsQeCGIAuTzjW6XLbRxGr19YlHQaPEBa+Ikp/ClsVkneskqS+run/n6jxNBFtCgeMQ S5lvOAOf9HQz8OMH5DgTAKD8HoHcjWnLysD4FPMuLtU2VOcbgSwjE4P1vNo2w/dT9PtSimCZIBULl vdgo+u3gneYkWHI4zPqKJ+zN4n+pPN14NoxCNDXQ9b/K34PA0udlUm9PDv9Ht7JWDbCVj6Kq9ZVPD 8UwkyWYfHIIMCXdiaa79bYhFjpa7VZn8uvMHSYiMOQcq/mmU91AR337cTwSLfX8akmZ2ktSoeDcnc 77j0k3tQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wKDeb-0000000G0rW-3Nsc; Tue, 05 May 2026 11:09:29 +0000 Received: from mail11.truemail.it ([2001:4b7e:0:8::81]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wKDeZ-0000000G0qB-25Qj for linux-arm-kernel@lists.infradead.org; Tue, 05 May 2026 11:09:28 +0000 Received: from francesco-nb (248.201.173.83.static.wline.lns.sme.cust.swisscom.ch [83.173.201.248]) by mail11.truemail.it (Postfix) with ESMTPA id 354AC1FCE7; Tue, 5 May 2026 13:09:24 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dolcini.it; s=default; t=1777979365; bh=IVJfobToIIbQS+LK3dO6loNuJTGbzehi/g6dvyC5Lo8=; h=From:To:Subject; b=ahuSEwFqljaHr1P6lJsEoyZmO0bWCVLmwjY4uM/I1oxqM1w5hl+bm3Kq/pfYrqkf8 2wZKUOIGPUMteNwkiITvj+0Vcfqmo0ovLNnReEgh2+8lpQJZ7gxsAPYhAJjMMy51Gx Zoz5CKDpTU+gF8YQdYvt3eF6sC4RoerU41r5zEb/XfDI1b9zuw4fXJ+gkB1tcOWHXY zZThRIdhGwwhYfMY15YVyr85Nrh6MgTUMK7/kHJmm0/XhPa/SuocPCCsk6l3pmmIDQ FMSZn1qJP0BmTP/gVTFfwuw4arUtzilATcAGoa6EJtwWmvFlsqOambbUhgdOO0ZD/0 /nzVsil2cGSjA== Date: Tue, 5 May 2026 13:09:22 +0200 From: Francesco Dolcini To: Siddharth Vadapalli Cc: nm@ti.com, vigneshr@ti.com, kristo@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, josua@solid-run.com, w.egorov@phytec.de, matthias.schiffer@ew.tq-group.com, d.haller@phytec.de, francesco.dolcini@toradex.com, joao.goncalves@toradex.com, emanuele.ghidoli@toradex.com, ernest.vanhoecke@toradex.com, rogerq@kernel.org, eballetb@redhat.com, robertcnelson@gmail.com, afd@ti.com, u-kumar1@ti.com, stable@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, luis.parga@ti.com, srk@ti.com Subject: Re: [PATCH 12/13] arm64: dts: ti: k3-j722s-evm: fix USB clocking for compliance Message-ID: <20260505110922.GB69476@francesco-nb> References: <20260505110631.1144200-1-s-vadapalli@ti.com> <20260505110631.1144200-13-s-vadapalli@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260505110631.1144200-13-s-vadapalli@ti.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260505_040927_692905_9C391764 X-CRM114-Status: GOOD ( 13.95 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, May 05, 2026 at 04:36:13PM +0530, Siddharth Vadapalli wrote: > From: Luis Parga > > According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of > the USB 3.2 Specification, SSC should be enabled by default. This protects > against EMI violations. Hence, enable internal SSC for USB SuperSpeed. > > Fixes: 485705df5d5f ("arm64: dts: ti: k3-j722s: Enable PCIe and USB support on J722S-EVM") > Cc: > Signed-off-by: Luis Parga > Signed-off-by: Siddharth Vadapalli > --- > arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts > index e66330c71593..de62b7e135c6 100644 > --- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts > +++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts > @@ -746,6 +746,11 @@ &serdes_ln_ctrl { > > &serdes_wiz0 { > status = "okay"; > + ti,core-clk-sel = <1>; /* Select internal reference clock */ > + ti,ssc-enable; /* Enable SSC */ > + ti,ssc-type = <1>; /* 1 for Downspread */ > + ti,ssc-frequency-hz = <33000>; /* 33 KHz */ > + ti,ssc-depth-per-mil = <5>; /* 0.5% depth */ before status